Lieutenant-Colonel Harry Reginald Antony Streather OBE (24 March 1926 – 31 October 2018) was a British Army officer who served in the Gloucestershire Regiment, and mountaineer who first-ascended the third-highest mountain in the world, on the 1955 British Kangchenjunga expedition, and Tirich Mir. Streather was the first man ever to climb two peaks higher than 25,000 feet (7,600 m).